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Critical entanglement of XXZ Heisenberg chains with defects

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arxiv cond-mat/0509338 v1 pith:AHTMNCTJ submitted 2005-09-13 cond-mat.stat-mech

Jize Zhao , Ingo Peschel , Xiaoqun Wang This is my paper · ORCID
classification cond-mat.stat-mech
keywords entanglementcentralchainsheisenbergregionanisotropicantiferromagneticbehaviour
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We study the entanglement properties of anisotropic open spin one-half Heisenberg chains with a modified central bond. The entanglement entropy between the two half-chains is calculated with the density-matrix renormalization method (DMRG).We find a logarithmic behaviour with an effective central charge c' varying with the length of the system. It flows to one in the ferromagnetic region and to zero in the antiferromagnetic region of the model. In the XX case it has a non-universal limit and we recover previous results.

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  1. The Eigenstate Thermalization Hypothesis in a Quantum Point Contact Geometry

    cond-mat.stat-mech 2025-01 conditional novelty 5.0 of 10

    For two free-fermion lattices connected by a few quantum point contacts, the entanglement entropy of typical excited eigenstates grows only linearly with subsystem size, not extensively.

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